Characteristics of PM 1 /PM 2.5 /PM 10 were evaluated in the ambient general (Chung-Shan) and traffic (Da-Tung) monitoring stations in the Taipei area. It was observed that average concentrations of PM 1 , PM 2.5 , and PM 10 were 14.0, 24.4, and 48.1 w g/m 3 in the Chung-Shan station, respectively. In the Da-Tung station, the mean levels of PM 1 , PM 2.5 , and PM 10 were 37.6, 42.8, and 61.5 w g/m 3 , respectively. In addition, it was found that PM 1 /PM 2.5 mass ratios could be as high as 0.90 in the traffic station. Regarding carbon profiles, it was observed that mass fractions of total carbon in PM 1 , PM 2.5 , and PM 10 were 0.58, 0.49, and 0.35 in the Chung-Shan station and 0.74, 0.66, and 0.53 in the Da-Tung station, respectively. It was clearly indicated that fine particles related to combustion sources play an important role in urban atmosphere. Further investigation is needed to evaluate chemical compositions and health effects of PM 1 .
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PM 1 /PM 2.5 /PM 10 Characteristics in the Urban Atmosphere of Taipei
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